Use the References to access importast values If needed for this question Igniti

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Use the References to access importast values If needed for this question Ignition res heat sample Thermometer Stirer A bomb calerimeter, or constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. Since the "bomb" itself can absorb energy, a separate experiment is neded to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter Water In the laboratory a student burns a 0.398-g sample of 1,6-hesanediol (CoH40) in a bomb calorimeter containing 1090. g of water The temperature increases from 24.50 °C to 26.90 °C. The heat capacity of water is 4.184 1g c The molar heat of combustion is -3792 kJ per mole of 1,6-hexanediol. C,H140(6)+17/2 02(2)6 Co() 7 H0() Energ Calculate the heat capacity of the calorimeter. Insulated Sample Buning Stool outside dish sample bomb chamber heat capacity of calorimeter .or"btíst kn ( boot) calorimeter. Submit Answer

Explanation / Answer

Ans 1

Energy balance

Heat released by combustion reaction = Heat absorbed by water + Heat absorbed by calorimeter

Heat of reaction x mass of sample = mass of water x Cp x (T2-T1) + C x (T2-T1)

3792 kJ/mol x 1mol/118g x 0.398g = 1090 g x 1kg/1000g x 4.184 kJ/kg-K x (26.90 - 24.50)K + C x (26.90 - 24.50)K

12.789 kJ = 10.945 kJ + C x 2.4

C x 2.4 = 1.844

C = 0.7683 kJ/°C x 1000J/kJ

= 768.3 J/°C

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